EP0793080A1 - Dispositif et procédé pour la dosage d'au moins un fluide, particulièrement un fluide visqueux - Google Patents

Dispositif et procédé pour la dosage d'au moins un fluide, particulièrement un fluide visqueux Download PDF

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Publication number
EP0793080A1
EP0793080A1 EP97200422A EP97200422A EP0793080A1 EP 0793080 A1 EP0793080 A1 EP 0793080A1 EP 97200422 A EP97200422 A EP 97200422A EP 97200422 A EP97200422 A EP 97200422A EP 0793080 A1 EP0793080 A1 EP 0793080A1
Authority
EP
European Patent Office
Prior art keywords
dosing
cylinder
piston
medium
dosing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97200422A
Other languages
German (de)
English (en)
Inventor
Marinus Bernardus Emerentianus De Kadt
Franciscus Cornelis De Wit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unitrans Techniek BV
Original Assignee
Unitrans Techniek BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unitrans Techniek BV filed Critical Unitrans Techniek BV
Publication of EP0793080A1 publication Critical patent/EP0793080A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • G01F11/023—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with provision for varying the stroke of the piston
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
    • G01F3/14—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising reciprocating pistons, e.g. reciprocating in a rotating body
    • G01F3/16—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising reciprocating pistons, e.g. reciprocating in a rotating body in stationary cylinders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
    • G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
    • G01F3/14—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising reciprocating pistons, e.g. reciprocating in a rotating body
    • G01F3/16—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising reciprocating pistons, e.g. reciprocating in a rotating body in stationary cylinders
    • G01F3/18—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising reciprocating pistons, e.g. reciprocating in a rotating body in stationary cylinders involving two or more cylinders

Definitions

  • the invention relates to a dosing device for dosing at least one medium, said device comprising
  • a device of this kind is known from European patent publication No. 0 525 864 (Kuma Rsp B.V.).
  • the known dosing device includes three cylinder/piston units for dosing various liquids, with the respective dosing elements of the liquids being interconnected in such a manner that said liquids can be dosed in a predetermined ratio.
  • Each cylinder/piston unit is connected to a two-way switch valve, which is actuated in dependence on an end position of the respective piston.
  • Each switch valve is provided with a liquid inlet and a liquid outlet, and also with two overflow pipes, which are each connected to one of the cylinder spaces.
  • the known device is self-driving, since the respective dosing elements are also interconnected by means of a leaf spring, which leaf spring is tensioned during movement of the dosing elements and which thus possesses sufficient energy-generating capacity for reversing the two-way switch valves at the end of each stroke.
  • One drawback of the known dosing device is that it is in particular unsuitable for dosing a viscous medium, that is, a medium having a (kinematic) viscosity of about 10,000 cSt (centistokes), since it is exactly viscous mediums that may exhibit the problem of a piston drawing a vacuum in a cylinder/piston unit at the beginning of a stroke, with all the adverse consequences for the (fine) dosing of the medium.
  • a viscous medium that is, a medium having a (kinematic) viscosity of about 10,000 cSt (centistokes)
  • the object of the invention is to provide a simple, reliable and efficiently operating dosing device for dosing at least one medium (preferably a viscous medium), wherein the drawbacks of the prior art referred to above have been obviated.
  • a dosing device of the kind referred to in the introduction includes means for reversing the control position of the control valves in dependence on a predetermined magnitude of the pressure within the cylinder.
  • Said means form a pressure switch or pressostat, as it were, whereby a predetermined, preferably even adjustable magnitude of the pressure built up by the medium within the cylinder causes the control position of the control valves to be reversed, possibly also by means of "end switches", which actuate the two-way switch valves at the end of each piston stroke.
  • the adjustability referred to above is of particular importance in view of the pump capacity which in practice may vary with each pump that is connected.
  • the dosing device in accordance with the invention is particularly suitable for dosing a medium having a viscosity of 10,000 cSt (centistokes), preferably 12,000 cSt, more in particular 15,000 cSt or higher.
  • a dosing device for dosing a viscous medium as such is known per se from European patent No. 0 141 930 (Reinhardt-Technik GmbH & Co.).
  • this known dosing device two pressure cylinders are used for each substance.
  • Said pressure cylinders are connected to a supply pump for the viscous substance by means of supply pipes fitted with non-return valves, and also, via pressure pipes fitted with valves, to an external power source.
  • Said European patent publication in particular makes mention of a plastic as the viscous substance, which plastic is for example applied to an object in the form of a coating.
  • 0 141 930 is the fact that, as already said before, two pressure cylinders must be used for each viscous substance in order to achieve continuous dosing of the substance, whilst furthermore one or more external power sources must be provided for driving the pressure cylinders. Because of this the known dosing device is a complex device, which consequently requires regular maintenance and sometimes even leads to the failure of one or more parts of the dosing device, with all the ensuing adverse economic consequences for the company in question. Furthermore it will be obvious that because of its complex construction this prior art dosing device is relatively costly, which renders its use on a wide scale in all kinds of small and/or medium-sized enterprises virtually impossible.
  • a preferred embodiment of a dosing device according to the invention for dosing at least two mediums is consequently provided with at least two cylinder/piston units, whilst the respective dosing elements are interconnected in such a manner that the mediums can be dosed in a predetermined ratio. More in particular this ratio is adjustable. This makes it possible to dose the various mediums in various precise ratios.
  • each cylinder/piston unit is provided with said pressure switch (pressostat), for example in an associated supply pipe. In some cases it may suffice to provide one pressure switch for two or more cylinder/piston units, for example when identical units are being used and the respective mediums are to be mixed in identical ratios.
  • a dosing device in another preferred embodiment of a dosing device according to the invention said dosing elements are mechanically interconnected.
  • the respective dosing elements rigidly, in particular either by means of (cross) rods on either side of the respective cylinder/piston units (see Figure 2 to be discussed hereafter), or by means of a direct connection of the dosing elements at their respective end faces (see Figure 3 to be discussed hereafter)
  • the dosing elements are interconnected via a lever mechanism for dosing the mediums corresponding therewith in a predetermined ratio of mutually differing (momentaneous) amounts (see Figure 2).
  • the dosing elements are hydraulically interconnected.
  • Another preferred embodiment of a dosing device according to the invention for dosing three mediums is provided with three cylinder/piston units, whilst the respective dosing elements of the first and the second cylinder/piston unit are mechanically interconnected in such a manner that the mediums corresponding therewith can be dosed in a predetermined ratio of at least substantially equal amounts, whilst the dosing element of the third cylinder/piston unit is connected, via a lever mechanism, to the assembly of the other dosing elements in such a manner that the third medium can be fine-dosed in a predetermined ratio.
  • the dosing elements of the first and the second cylinder/piston unit are interconnected by means of a rod, to which rod the third element is connected by means of a lever, which lever is fixedly mounted near/at one of its ends. It is thereby preferred for the third dosing element to be connected to the lever at varying distances from said fixed end, which makes it possible to adjust the dosing ratio.
  • the invention furthermore relates to a method for dosing at least one medium, in particular, but not exclusively, a viscous medium, to be used in a dosing device according to the invention. According to this method
  • Figure 1 shows a column 1 with a horizontal pin 2 present at the upper side thereof.
  • Two levers 3,4 are pivoted about said pin 2, with rods 7,8 being connected to the free ends 5,6 thereof.
  • Rods 7,8 constitute the piston rods of pressure cylinders 9,10, so that levers 3,4 alternately occupy the upper and lower position ( Figure 1).
  • Connected to lever 3 are furthermore the ends of rods 10,11, which extend plunger-like into pressure cylinders (not shown) for a component A or B of a two-component plastic.
  • lever 4 is pivotably connected to rods 12,13 of two pressure cylinders 14,15.
  • the pressure cylinders are fixedly yet detachably connected to column 1.
  • Figure 2 relates to a preferred variant of the invention.
  • each medium is pumped, via a supply pipe (19,20,21), to a three-way valve (22,23,24) by means of a pump (16,17,18) - which is present in a storage vessel.
  • the pipes are provided with means for monitoring the pressure in the cylinders, in this case pressure switches or pressostats (52), whose operation will be explained in more detail hereafter.
  • the supply pipe is split into two branches (25,26,27; 28,29,30), which are each connected to one side of a "double-action" cylinder (31,32,33).
  • the operation of each cylinder is as follows.
  • each medium flows to a mixing block (43) via an outlet pipe (40,41,42).
  • the outflow pipe may be provided with a pulse damper (44) for levelling out the pressure difference resulting from the reversal of the direction of movement of the pistons.
  • the medium flows out in mixed condition via a central outlet pipe (45).
  • the dosing elements (49,50) (piston rods) of the cylinders (34,35) are rigidly coupled by means of a rod (46), both at their upper sides and at their bottom sides.
  • Figure 3 schematically shows a variant of the cross connection of the dosing elements (49,50) of the cylinders (31,32) shown in Figure 2, wherein the dosing elements (49,50), which in this case are positioned one behind the other, seen in longitudinal direction, with their end faces facing each other, are interconnected by means not shown.
  • the dosing elements (49,50) which in this case are positioned one behind the other, seen in longitudinal direction, with their end faces facing each other, are interconnected by means not shown.
  • Parts that correspond with parts shown in Figure 2 are indicated by the same numerals as in Figure 2.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Accessories For Mixers (AREA)
EP97200422A 1996-02-29 1997-02-14 Dispositif et procédé pour la dosage d'au moins un fluide, particulièrement un fluide visqueux Withdrawn EP0793080A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1002481A NL1002481C2 (nl) 1996-02-29 1996-02-29 Inrichting en werkwijze voor het doseren van ten minste een medium, in het bijzonder, doch niet uitsluitend een visceus medium.
NL1002481 1996-02-29

Publications (1)

Publication Number Publication Date
EP0793080A1 true EP0793080A1 (fr) 1997-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200422A Withdrawn EP0793080A1 (fr) 1996-02-29 1997-02-14 Dispositif et procédé pour la dosage d'au moins un fluide, particulièrement un fluide visqueux

Country Status (2)

Country Link
EP (1) EP0793080A1 (fr)
NL (1) NL1002481C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2678645A4 (fr) * 2011-02-25 2018-01-31 EC Instruments AB Débitmètre à piston en continu

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH109727A (de) * 1924-02-19 1925-04-16 Knapp Wolfgang Volumetrische Flüssigkeitsmessvorrichtung.
US2755966A (en) * 1950-05-01 1956-07-24 Lindars Herman Apparatus for dispensing measured quantities of liquid materials
DE3319861A1 (de) * 1983-06-01 1984-12-06 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar Gasmengendurchfluss-messgeraet
EP0141930A2 (fr) 1983-08-12 1985-05-22 Reinhardt-Technik GmbH & Co. Procédé et dispositif pour le dosage d'au moins une matière visqueuse
DE4028734A1 (de) * 1990-09-10 1992-03-12 Tecalemit Gmbh Deutsche System zur eichgerechten abgabe von fluiden fuer kraftfahrzeuge
DE9202287U1 (de) * 1992-02-21 1992-04-16 Kurz, Rupert F., Dipl.-Ing. (FH), 8022 Grünwald Feindosiergerät für Flüssigkeiten
EP0525864A1 (fr) 1991-07-16 1993-02-03 Kuma Rsp B.V. Dispositif pour la délivrance d'au moins deux fluides dans une proportion déterminée
WO1993008401A2 (fr) * 1991-10-16 1993-04-29 Lucas Automation And Control Engineering Limited Equipement de dosage volumetrique
FR2707003A1 (en) * 1993-06-25 1994-12-30 Siretchi Roman Device for measuring small fluid flow rates

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH109727A (de) * 1924-02-19 1925-04-16 Knapp Wolfgang Volumetrische Flüssigkeitsmessvorrichtung.
US2755966A (en) * 1950-05-01 1956-07-24 Lindars Herman Apparatus for dispensing measured quantities of liquid materials
DE3319861A1 (de) * 1983-06-01 1984-12-06 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh, 6334 Asslar Gasmengendurchfluss-messgeraet
EP0141930A2 (fr) 1983-08-12 1985-05-22 Reinhardt-Technik GmbH & Co. Procédé et dispositif pour le dosage d'au moins une matière visqueuse
DE3415253A1 (de) * 1983-08-12 1985-10-31 Reinhardt-Technik Gmbh & Co, 5883 Kierspe Vorrichtung zum dosieren von einem viskosen stoff, bei niedrigem anlagedruck
DE4028734A1 (de) * 1990-09-10 1992-03-12 Tecalemit Gmbh Deutsche System zur eichgerechten abgabe von fluiden fuer kraftfahrzeuge
EP0525864A1 (fr) 1991-07-16 1993-02-03 Kuma Rsp B.V. Dispositif pour la délivrance d'au moins deux fluides dans une proportion déterminée
WO1993008401A2 (fr) * 1991-10-16 1993-04-29 Lucas Automation And Control Engineering Limited Equipement de dosage volumetrique
DE9202287U1 (de) * 1992-02-21 1992-04-16 Kurz, Rupert F., Dipl.-Ing. (FH), 8022 Grünwald Feindosiergerät für Flüssigkeiten
FR2707003A1 (en) * 1993-06-25 1994-12-30 Siretchi Roman Device for measuring small fluid flow rates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2678645A4 (fr) * 2011-02-25 2018-01-31 EC Instruments AB Débitmètre à piston en continu

Also Published As

Publication number Publication date
NL1002481C2 (nl) 1997-09-01

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